Abstract
In order to improve the properties of lime-based mortars and promote the green development of the construction industry, blended lime-based mortars were prepared by using carbide slag instead of hydrated lime, and the additions of Portland cement and sulphoaluminate cement were studied in our work. The paper focused on mechanical properties, porosity, capillary water absorption and drying shrinkage of both types of blended mortars. The chemical composition and microstructure of hydration products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that sulphoaluminate cement provided more contributions to mechanical properties, capillary water absorption and early shrinkage compared to Portland cement.
Highlights
Air lime mortars have been used in construction since ancient times, which play the roles of bonding and decoration
This study focuses on the comparison between carbide slag-sulphoaluminate cement blended mortars and carbide slag-Portland cement blended mortars in terms of bulk density, porosity, capillary water absorption, drying shrinkage and mechanical properties
For CS-PC blended mortars, compressive and have almost no change until the content of Portland cement is more than 20%, which is in agreement flexural strength have almost no change until the content of Portland cement is more than 20%, which with Arandigoyen et al [9] and Silva et al [12]
Summary
Air lime mortars have been used in construction since ancient times, which play the roles of bonding and decoration. Cement mortars with the characters of fast setting and high mechanical strength are widely used in building projects now. With the ever-increasing requirement for energy conservation and environmental protection, air lime mortars have aroused interest of the construction industry. In comparison to cement production, air lime has low energy consumption and less CO2 emissions [3]. Air lime mortars have good water retention and plasticity. Some problems remain with the use of air lime mortars as a building mortars, such as low mechanical strength, slow setting and hardening time, high water absorption by capacity, large shrinkage, and poor durability [4,5,6]
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